Coupling for cleaners



May a, 1930. 0.7 EINGBERG ET AL 1,757,240

' COQPLING FOR CLEANERS Original Filed June is, 1925 w l NVE NTOR Q 4Patented Mav s 19 Y I UNITED STAT E's -l -ATENT= oFFIcE AXEI; OI1OIEENG-BERG- AND FREDRIK CARLSTEDT, OF STOCKHOLM, SWEDEN, AS-

SIGNORS TO EVENT-IA. PATENT-VERWERTUNGS-GESELLSQHAFT, HAUSEN,SWITZERLAND, A CORPORATION OF SWITZERLAND or semicournme FOB CLEANERSOriginal application filed June 15, 1926, Serial No. 116,123, and inSweden Deeemberw, 1925. Divided and this application filed December 22,1926. Serial No. 156,464.

This application is a division of our copending application Serial No.116,123, filed June 15th, 1926. a

Our invention relates to cleaners of the 5 type wherein a current of airis employed. More particularly, our invention relates to cleaners of thetype generally known as vacuum cleaners. Our cleaner is, however, notalone a vacuum cleaner, that is, one which induces the airleontainingthe dust and dirt, but is also a blower by means of which a forcedcurrent of air can be projected against a place to be cleaned.

One object of our invention is to produce a vacuum cleaner to a'suitableblower. ,To accomplish this, we provide a coupling which is readilyinsertable in either of several openings and which is adapted to receivea hose. The coupling is of such construction as to provide airpassagesof variable size. It also is so constructed as to provide a neatappearance when fitted to the cleaner unit. A further object is toprovide, a novel coupling bevacuum cleaner.

Referring to the accompanying drawing which shows a preferred form ofapparatus embodying the invention:

Fig. 1 is a longitudinal cross-sectional view of a cleaner embodying theinvention; and

Fig. 2 is an assembly view of a cleaner com prisingthe main unit shown,in Fig. 1. The main unit of the'cleaner comprises a casing, in turncomprising a main cylindrical barrel 10 consisting of stiff materialsuch as thin sheet metalsurrounded by fibrous material or leathercomposition and having attaehed thereto at one end a metal bell 11. and,

at the other end, a metal housing 12. Housing 12 contains the electricmotor 13 and the fan 14. which serve to cause flow of air through thecasing in the direction indicated by-arrows.- Forward of housing 12,that 1s, in

direction toward bell 11, is a disinfecting air filter 15 and forward ofthe filter 15 is a dust bag 16. The forward end of the dust bag consistsof a flanged metal ring 17, around the flange of whic is placed a rubberwasher 18. The flange of ring -17 and the rubber cleaner which isreadily converted from atween the hose member and main unit of a washer18 are clamped between .bell 11 and the flange 19 of a circular ring 20attached to I the forward end of the main barrel by means of rivets 21and forming part of the main barrel.

A central coupling 23 is screw-threaded into a central opening 8 in bell11 by means jammed. The coupling comprises a ring portion 31, a centralcylindrical portion 32 of smaller diameter than thering portion andcoaxial with the-ri g portion and an annular bridge section 33connecting the ring portion with the central portion and extendingobliquely to the axis of the ring portion and the central portion. Thecentral tapered bore25 extending through thecontral portion has itssmallest \\'idth adjacent the ring portion. The central cylindrical.portion extends axially a substantial distance from the nnr row part ofthe bridge section to provide a hand gri surface. The hand grip surfaceis a roug lened surface due to ribs 27, providing an easy grasp.Coupling 23 is readily removable from bell 11 by mere application of andturning by the hand.

Air hose 26 leads to mouth piece 22 into which the dust passes insuction operation, an

extension 9 being used between the mouthpiece and the air hose,ifdesired.

thus

26 and mouthpiece 22 and into dust bag 16 where the dust is deposited,and from which the air, after passing through the cloth of the dust bag.)asses through the lilter 15, thence through an l-l and out to thenl'n1os-" here through opening 28 at the rear ond of rousing 12. Opening8 may be considered as the air inlet and opening 28 as the air outletfor the unit.

The dust bag of whit-lithe main portion is preferably made of cloth, isattached to ring 17 in any desired manner. The dust bag can be removedfrom the barrel, to expel the dust collected within the same, by first".unclamping and removing bell 11, after which the dustbag is drawnforward through the forward end openin' of the barrel formed by ring 20;As pre erred means for clamping bell 11 to the main barrel there areused a series of sprin clamps 29 which com rise a lever 30, a hoo 37 anda spring 36. ell 11 is unclamped-by pulling lever 30 away from thebarrel, where y the spring 36 is released and the hook'37 can be removedfrom the shoulder on bell l1.

The central coupling 23' serves two .pur-- poses: First, it serves toprevent transmission of electricity from the main parts of the cleanerto the hose 26 and thus to the body of the operator, and for thispurpose, is made of non-conducting material, preferably ebonite; andsecond, it serves to make the cleaner reversible and transform the samefrom a vacuum cleaner into a blower. The reason for making coupling 23of non-conducting material is that it might happen that partsbecome-short-circuited and this member serves to prevent a shock to theerson l larger than the 0pening'25. The purpose- A coupling for use invacuum cleaners comprising a ring portion, a central cylindrical portionof smaller diameter than the ring portion coaxial with the ring portionand an annular bridge section connecting the ring portion with thecentral portion and extending obliquely to the axis of the ring portionand the central portion, said central portion having a passagewaytherethrough, and said central cylindrical portion extending-axially asubstantial distance from the narrow part of the bridge section andproviding a hand gri surface. 1

igned at Stockholm, Sweden, this 17th day of November, A. D. 1926.

AXEL OLOF ENGBERG. FREDRIK CARLSTEDT.

with or without the attachment of a mouth.

piece. In this operation it is obviously preferable to remove the dustbag. Upon switching on the current, air is then drawn in through theopening 8 in hell 11, through the main barrel,- through fan 14, pastmotor 13 and out through opening 28 to form the ventilating or blowingcurrent.

The opening 28 and the corresponding opening 8 inJbell 11 are madeconsiderably of this construction is to reduce the friction andthrottling losses. If the opening 8' in bell 11 were as small as opening25, a considerable resistance would result for the air flowing throughthe opening 8 when coupling 23 is inserted in opemiilgs 28 and theapparatus is used as a blower. o, in normal evacuating operation, it ispreferable to have a large air outlet, in order to avoid resistance onthe outlet side of the fan and accompanying loss in eificiency.

The main barrel 10 and associated parts are mounted upon runners 60 ofwhich there are two, one positioned on either side of the main barrel,and which form a sled carriage for the main unit.

In order tocarry the main-cleaner unit comprising a main barrel 10 andattached parts, a resilient stra 65 is provided.

Having thus descri d our invention,-what we claim is:- Y

